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This method results in multiple receiver observations for the same transmit symbol, as in the case of a diversity system.
In a diversity system, the transmitter power control algorithm should control the power of the diversity combiner output in the receiver.
The amount of fading (AoF) is a simple measure for the performance of a diversity system which is defined as eta_{gamma}=frac{mu_{2}}{{mu_{1}^{2}}}-1 (32).
As suggested in [20], in the general context of describing the behaviour of a diversity system with arbitrary combining techniques, the channel quality based on channel statistics can be used for performance evaluation.
In general, a MIMO system with M t transmitter antennas and N r receiver antennas can be used as a diversity system having M t × N r independent diversity branches [37].
We consider a diversity system, for which, when the SNR of the currently connected branch falls below a predetermined threshold, the receiver switches to and stays with another branch, regardless of whether the SNR of that branch is above or below the predetermined threshold.
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The simulated and approximated SER values for a modulation diversity system (with 16-QAM) are presented in the figure.
Therefore, a polarization diversity system, such as polarization rotator [13 15], needs to be integrated into the circuit.
The simulated and approximated SER values for a modulation diversity system (with QPSK) are shown in the figure.
A path diversity system may use multiple paths at the same time or may perform path selection to switch among them.
In this mode, which is commonly called a transmit diversity system, the same data is sent to both of the transmitting antennas but is coded in such a way that the receiver can identify each transmitter.
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